A sample of Tetramethylammonium Fluoride, Tetrahydrate was submitted for Thermogravimetric Analysis (TGA). The thermogram for the Tetramethylammonium Fluoride Tetrahydrate sample exhibited an immediate weight loss, slowing briefly at an inflection point at 183°C, then increasing in slope again as the thermogram dropped toward 100% decomposition. No residue remained in the sample pan following the analysis of this sample.